diff --git a/client/src/cmdlfhitag.c b/client/src/cmdlfhitag.c
index 89a030d62..d439eb814 100644
--- a/client/src/cmdlfhitag.c
+++ b/client/src/cmdlfhitag.c
@@ -780,7 +780,7 @@ static int CmdLFHitagWriter(const char *Cmd) {
     }
     if (h24) {
         htf = WHT2F_CRYPTO;
-        memcpy(htd.pwd.password, key, 4);
+        memcpy(htd.pwd.password, key, 6);
         memcpy(htd.crypto.data, data, sizeof(data));
     }
     if (h27) {